LIST OE PLATES. 



PLATE I. 



Sargassum vulgare. 

 la, air-vessel. 



1 h, spore-receptacles. 

 Halidrys siliquosa. 



2 a, section of receptacle, 



showing spores. 

 Pycnophycus tuberculatus. 



3 a, section of receptacle, 



showing spores. 

 Leathesia tuberiformis. 



4 «, filaments with spores. 



PLATE II. 



1. Fucus vesiculosus. 



1 a, section of receptacle, 



showing spores. 



2. Asperccoccus Turneri. 



2 a, part of frond, showing 



spore-clusters. 



3. Laurencia csespitosa. 



3 a, tip of branch, showing 



tetraspores. 



PLATE III. 



1. Fucus nodosus. 



1 a, segment of a spore- 

 receptacle. 



2. Fucus anceps. 



2 a, pointed spore-recep- 

 tacle. 



2 b, branchlet with anthe- 



ridia. 



3. Haliseris polypodioides. 



3 a, portion of frond with 



sorus. 



4. Sphacelaria filicina. 



4 a, a pinna. 



PLATE IV. 



1. Fucus canaliculars. 



1 a, part of spore-recep- 

 tacle. 



1 b, section of spore-recep- 



tacle. 



2. Delesseria ruscifolia. 



2 a, tip of leaf with spore- 



conceptacle. 



3. Schizymenia edulis. 



3 a, section of frond, show- 



ing spore -clusters. 



PLATE v. 



1. Alaria esculenta. 



la, section of part of a 

 sorus. 



2. Laminaria saccharina. 



2 a, slice of frond. 



